/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package edu.hawaii.wicket.page;

import java.text.DateFormat;
import java.util.Date;
import java.util.TimeZone;

import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.model.AbstractReadOnlyModel;


/**
 * A simple component that displays current time.
 * 
 * @author Igor Vaynberg (ivaynberg)
 */
public class Clock extends Label { 
  private static final long serialVersionUID = 1L;
    /**
     * Constructor.
     * 
     * @param id Component id
     * @param tz Timezone
     */
    public Clock(String id, TimeZone tz) { 
        super(id, new ClockModel(tz));

    }

    /**
     * A model that returns current time in the specified timezone via a formatted string.
     * 
     * @author Igor Vaynberg (ivaynberg)
     */
    private static class ClockModel extends AbstractReadOnlyModel<String> { 
      private static final long serialVersionUID = 1L;
        private final DateFormat df;

        /**
         * Constructor.
         * @param tz time zone.
         */
        public ClockModel(TimeZone tz) { 
            df = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.MEDIUM);
            df.setTimeZone(tz);
        }


        @Override
        /**
         * Returns the object.
         * @see org.apache.wicket.model.AbstractReadOnlyModel#getObject().
         */
        public String getObject() { 
            return df.format(new Date());
        }
    }
}